Twitter suspended Donald Trump Jr. after he shared a video that claimed hydroxychloroquine was “a cure” for Covid-19. President Trump shared the same video with his followers through a retweet. | Mark Wilson/Getty Images

A doctor who thinks alien DNA is used in medicine now says hydroxychloroquine is the cure for Covid-19.

Social media platforms are struggling to contain a new round of coronavirus conspiracy theories thanks, in part, to Donald Trump.

On Monday night, the president retweeted multiple accounts that posted a video falsely claiming that hydroxychloroquine cured Covid-19, including one tweet from his son, Donald Trump Jr. Many of those tweets were later removed, and Twitter suspended several of the users behind them, including Trump’s son, for 12 hours. But the video itself has continued to spread across social media platforms, raising fresh questions about